<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>注册</title>
</head>
<body>
    <form action="{{ url_for('add_user') }}" method="post">
        
        <p>
            姓名：<input type="text" name="username">
        </p>
        <p>
            <input type="submit">
        </p>
        
    </form>
</body>
</html>